condensation in attic - Home Energy Pros2015-03-03T20:33:59Zhttp://homeenergypros.lbl.gov/forum/topics/condensation-in-attic?commentId=6069565%3AComment%3A105231&xg_source=activity&feed=yes&xn_auth=noYou absolutely have to identi…tag:homeenergypros.lbl.gov,2013-02-19:6069565:Comment:1055562013-02-19T19:46:40.275ZJoseph Novellahttp://homeenergypros.lbl.gov/profile/JoeNovella
<p>You absolutely have to identify the source of the moisture. In the winter time, if outside relative humidity levels are low or if below freezing, then the moisture must be coming from the house. Look for bathroom vents or a bypass that could possible be feeding the attic. I don't believe the attic floor CAN be properly air sealed if the air exchange rate is 6.6.</p>
<p>You absolutely have to identify the source of the moisture. In the winter time, if outside relative humidity levels are low or if below freezing, then the moisture must be coming from the house. Look for bathroom vents or a bypass that could possible be feeding the attic. I don't believe the attic floor CAN be properly air sealed if the air exchange rate is 6.6.</p> Does the homeowner humidify h…tag:homeenergypros.lbl.gov,2013-02-17:6069565:Comment:1054402013-02-17T04:15:17.875ZPeter Krychhttp://homeenergypros.lbl.gov/profile/PeterKrych
<p>Does the homeowner humidify his home with unit attached to his furnace? Those devices can over humidify and send excessive moisture even into a well sealed attic.</p>
<p>Does the homeowner humidify his home with unit attached to his furnace? Those devices can over humidify and send excessive moisture even into a well sealed attic.</p> I put a HOBO in crawl space t…tag:homeenergypros.lbl.gov,2013-02-16:6069565:Comment:1054082013-02-16T00:19:35.873ZEric Kjelshushttp://homeenergypros.lbl.gov/profile/EricKjelshus
<p>I put a HOBO in crawl space that was wet to damp but out side was very dry. The water line was dripping from the fitting from poly to steel 7 places. Water mist ran a 2nd floor 18' into dirt rotted the rim and got floor board very soft then made the floor joust like rubber. This took 20 yr. The HOBO would read 70% when dry and 95% when raining out side. </p>
<p>I put a HOBO in crawl space that was wet to damp but out side was very dry. The water line was dripping from the fitting from poly to steel 7 places. Water mist ran a 2nd floor 18' into dirt rotted the rim and got floor board very soft then made the floor joust like rubber. This took 20 yr. The HOBO would read 70% when dry and 95% when raining out side. </p> Was just following this conve…tag:homeenergypros.lbl.gov,2013-02-16:6069565:Comment:1051842013-02-16T00:02:14.303ZNoah Glatfelterhttp://homeenergypros.lbl.gov/profile/NoahGlatfelter
<p>Was just following this conversation, just wanted to add to make sure to check all the penetrations through the roof. Its possible that pipe boots could be failing. They get dry rotted and loose there elasticity. If rain combines with wind to move the pipe, rain will run right down the pipe and drip into the insulation and not be seen on the underside of the roof deck. </p>
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<p>Good Luck </p>
<p>Was just following this conversation, just wanted to add to make sure to check all the penetrations through the roof. Its possible that pipe boots could be failing. They get dry rotted and loose there elasticity. If rain combines with wind to move the pipe, rain will run right down the pipe and drip into the insulation and not be seen on the underside of the roof deck. </p>
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<p>Good Luck </p> I would look for bypasses fro…tag:homeenergypros.lbl.gov,2013-02-15:6069565:Comment:1049812013-02-15T01:00:05.531ZNorbert Mullerhttp://homeenergypros.lbl.gov/profile/NorbertMuller
I would look for bypasses from the basement to the attic and check out the duct connection on the fans. Looking at the duct, I doubt that there is a lot of air being exhausted. Is the roof deck always wet or is it seasonal?
I would look for bypasses from the basement to the attic and check out the duct connection on the fans. Looking at the duct, I doubt that there is a lot of air being exhausted. Is the roof deck always wet or is it seasonal? 2 adults 1 child. flex duct…tag:homeenergypros.lbl.gov,2013-02-15:6069565:Comment:1050862013-02-15T00:45:06.991ZDwayne M Petkohttp://homeenergypros.lbl.gov/profile/DwayneMPetko
<p>2 adults 1 child. flex duct is for 2 bath fans. there is no ridge venting. attic moisture is on plywood on underside of roof only. no wet of damp insulation. heating is forced air gas, I don't know how old. front of house faces due west. </p>
<p>2 adults 1 child. flex duct is for 2 bath fans. there is no ridge venting. attic moisture is on plywood on underside of roof only. no wet of damp insulation. heating is forced air gas, I don't know how old. front of house faces due west. </p> Before I comment I have a few…tag:homeenergypros.lbl.gov,2013-02-14:6069565:Comment:1052422013-02-14T19:49:05.051ZNorbert Mullerhttp://homeenergypros.lbl.gov/profile/NorbertMuller
<p>Before I comment I have a few questions. What is the orientation of the home? How many occupants? The flex duct is for 2 bath fans? Does the home have ridge venting? If so what type? Where in the attic is the moisture, only on some areas or on all surfaces? What type of heating system and how old is it?</p>
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<p>Before I comment I have a few questions. What is the orientation of the home? How many occupants? The flex duct is for 2 bath fans? Does the home have ridge venting? If so what type? Where in the attic is the moisture, only on some areas or on all surfaces? What type of heating system and how old is it?</p>
<p></p> OK next is the insulation has…tag:homeenergypros.lbl.gov,2013-02-14:6069565:Comment:1049722013-02-14T17:05:26.501ZKevin Woodhttp://homeenergypros.lbl.gov/profile/KevinWood
<p>OK next is the insulation has become saturated somewhere and you will have to find the area. I would say it might be time to get a scan of the ceiling for cold spots and to check the area with a non invasive moisture meter. I have found situations where there is no evidence on the ceiling because of very good vapor control design. Also test the trusses at the top for extra high levels of moisture.</p>
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<p>OK next is the insulation has become saturated somewhere and you will have to find the area. I would say it might be time to get a scan of the ceiling for cold spots and to check the area with a non invasive moisture meter. I have found situations where there is no evidence on the ceiling because of very good vapor control design. Also test the trusses at the top for extra high levels of moisture.</p>
<p></p> thank you. that was my first…tag:homeenergypros.lbl.gov,2013-02-14:6069565:Comment:1050702013-02-14T16:49:45.295ZDwayne M Petkohttp://homeenergypros.lbl.gov/profile/DwayneMPetko
<p>thank you. that was my first recommendation. Homeowner did seal passage from porch to attic using polystyrenene boards sealed with dow spray foam. THis was completed 6 months ago before winter began and had no affect on condensation.</p>
<p>thank you. that was my first recommendation. Homeowner did seal passage from porch to attic using polystyrenene boards sealed with dow spray foam. THis was completed 6 months ago before winter began and had no affect on condensation.</p> Your problem is in design acc…tag:homeenergypros.lbl.gov,2013-02-14:6069565:Comment:1052312013-02-14T15:55:49.781ZKevin Woodhttp://homeenergypros.lbl.gov/profile/KevinWood
<p>Your problem is in design according to what I see in your first picture. The covered entrance section needs to be completely sealed and vented from the main attic from the inside. The moisture collected below the walk in area or patio is trapped at the soffit and has no where to go but up. Remove the travel to the main attic section and you will solve the moisture problem.</p>
<p>Your problem is in design according to what I see in your first picture. The covered entrance section needs to be completely sealed and vented from the main attic from the inside. The moisture collected below the walk in area or patio is trapped at the soffit and has no where to go but up. Remove the travel to the main attic section and you will solve the moisture problem.</p>